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Stability in a tank comes only when there is a balance between your bacterial population and the amount of Ammonia , Nitrates & Nitrites etc. produced.

Your tank is still pretty new , so some of your parameters will swing up and down a bit. This is quite normal and will settle in time.

Your pH is a little on the low side . This may be due to your salt mix , but can also be due to dissolved CO2 and O2 concentrations not being at a balanced level. I'm not an expert though and there could be other factors.
Unless the ventilation in your house and close to the tank is very poor , IMO the chances are fairly minimal that the amount of CO2 is causing the pH drop

Yes, you can buffer the pH upwards by means of additives but IMO I wouldn't do so at this point.First look at other causes.

Stability in a tank comes only when there is a balance between your bacterial population and the amount of Ammonia , Nitrates & Nitrites etc. produced.

Your tank is still pretty new , so some of your parameters will swing up and down a bit. This is quite normal and will settle in time.

Your pH is a little on the low side . This may be due to your salt mix , but can also be due to dissolved CO2 and O2 concentrations not being at a balanced level. Although IMO , I would probably look to the salt first.
Unless the ventilation in your house and close to the tank is very poor , the chances are fairly minimal that the amount of CO2 is causing the pH drop

Yes, you can buffer the pH upwards by means of additives but IMO I wouldn't do so at this point.First look at other causes such as salt .

How many waterchanges have you done ?
Have you measured the pH on the water & salt mix you use for waterchanges ?
What LS do you have in your tank at present ?

Be careful of what you add to your tank. My view on this is "If you can't test for it ... don't add it "

Just a thought

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I have changed 10% of the water every week. 4 changes.
I have not measured the pH on the water, but i will. I am also changing brand of salt to a noon pro salt (have been using RedSea pro salt up until now)

Just a question : Was your nano setup from scratch or did you use water & rock from a mature system ? ( Sorry I can't remember whether you already mentioned this in another post)

The reason I ask is because you already have a fair amount of livestock in your tank after only 5 weeks.

Sometimes you will get a "bad" batch of salt which can result in a lower pH. I seem to recall a thread some time ago where there was mention of different salt brands and the experience other reefers have had . Can't remember what the thread was called though

That is a lot of stock for 5 weeks old.
Did you cycle this tank as I doubt it would have cycled at this stage and that would account for your problems.

Are you hooked on the Damsels?
The reason I ask is they are cheep and a lot of people start off with them, but they get aggressive and can be almost impossible to catch at a later sage when your scaping is all sorted out.

Sometimes you will get a "bad" batch of salt which can result in a lower pH. I seem to recall a thread some time ago where there was mention of different salt brands and the experience other reefers have had . Can't remember what the thread was called though

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I will search for it. Someone told me that the "pro" salt has got a lot of trace elements in it, and if you don`t have a lot of corals the trace elements tend to pile up. (The salt i am changing to don`t have trace elements)

That is a lot of stock for 5 weeks old.
Did you cycle this tank as I doubt it would have cycled at this stage and that would account for your problems.

Are you hooked on the Damsels?
The reason I ask is they are cheep and a lot of people start off with them, but they get aggressive and can be almost impossible to catch at a later sage when your scaping is all sorted out.

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No i am not hooked on Damsels, but i was shopping for LS in the LFS that was nearest to me (3 hour's drive) And all they got was Damsel Not the hottest fish, but a start

I will search for it. Someone told me that the "pro" salt has got a lot of trace elements in it, and if you don`t have a lot of corals the trace elements tend to pile up. (The salt i am changing to don`t have trace elements)

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Mhhmmm. Knut ove , once again just my opinion but trace elements are good and neccessary for a healthy system. Trace elements are not just used by corals.

Besides , your water changes will also help in ensuring that you don't get a build up of excess nutrients etc.

I have been using RedSea pro, but now I got another that is not Pro type. in other word without the trace elements. I have had quite a algae growth , due to too much food inn the water. But the last few days after my clean up crew got bigger and applying phosphate remover I see that i am winning the battle